Collapsible heel with elastic side panels for easy on/off Oso fleece collar lining for added comfort Thermoball eco polyester insulation helps keep feet warm even when wet. Take on the snow in these cosy mules to grab the morning paper, or relax after a long day on the mountain by the fireside. Sub-zero conditions are no match for our ThermoBall™ insulation and cosy fleece lining, which keep your feet warm and snug when you're relaxing. When it's time to shuffle through the snow to bed, you'll find the tough ripstop material and high-traction rubber outsoles are just right for the job.